The first seismic zoning map of India was compiled by the GeologicalSurvey of India in 1935. The map was based on the extent of the damagesuffered in a particular region due to earthquake in the areas with anintensity higher than Rossi-Forel Intensiity VII (MM IntensityVIII). Since then a number of modifications have been made in theseismic zoning map of the country under the aegis of the Indian Bureauof Standards (BIS) as an important part of the standards for theEarthquake Resistant Design of Structures. The seismic zoning map isunder revision by the BIS.